support for license keys

core/product.go

@@ -12,6 +12,7 @@
 package core
 
 import "fmt"
+import "time"
 
 // ProdInfo describes a product
 type ProdInfo struct {
@@ -21,6 +22,7 @@ type ProdInfo struct {
 	Major   string
 	Minor   string
 	Patch   string
+	License License
 }
 
 // Product returns product edition details
@@ -31,6 +33,54 @@ func Product() (p ProdInfo) {
 	p.Version = fmt.Sprintf("%s.%s.%s", p.Major, p.Minor, p.Patch)
 	p.Edition = "Community"
 	p.Title = fmt.Sprintf("%s Edition", p.Edition)
+	p.License = License{}
 
-	return p
+	return
+}
+
+// License holds details of product license.
+type License struct {
+	Name    string    `json:"name"`
+	Email   string    `json:"email"`
+	Edition string    `json:"edition"`
+	Start   time.Time `json:"start"`
+	End     time.Time `json:"end"`
+	Seats   int       `json:"seats"`
+	Trial   bool      `json:"trial"`
+}
+
+// IsEmpty determines if we have a license.
+func (l *License) IsEmpty() bool {
+	return l.Seats == 0 && len(l.Name) == 0 && len(l.Email) == 0 && l.Start.Year() == 1 && l.End.Year() == 1
+}
+
+// IsValid determines if we have populated and valid license.
+// An empty license is valid.
+func (l *License) IsValid() bool {
+	if l.IsEmpty() {
+		return true
+	}
+
+	now := time.Now().UTC()
+	return l.End.Day() <= now.Day() && l.End.Month() <= now.Month() && l.End.Year() <= now.Year()
+}
+
+// Status returns formatted message stating if license is empty/populated and invalid/valid.
+func (l *License) Status() string {
+	lp := "populated"
+	if l.IsEmpty() {
+		lp = "empty"
+	}
+	lv := "invalid"
+	if l.IsValid() {
+		lv = "valid"
+	}
+
+	return fmt.Sprintf("License is %s and %s", lp, lv)
+}
+
+// LicenseData holds encrypted data and is unpacked into License.
+type LicenseData struct {
+	Key       string `json:"key"`
+	Signature string `json:"signature"`
 }